Alert archive / South Carolina / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 33, NWS Greenville-Spartanburg, SC

May 7, 1999Oconee County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at May 7, 1999, 6:47 AM EDT for Oconee County, South Carolina. It was in force for 33 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 7, 1999, 6:47 AM EDT (10:47 UTC)
Expired: May 7, 1999, 7:20 AM EDT
In force: 33 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Whole counties

County Oconee County, SC

The radar

The Greer radar (KGSP), 79 km from the middle of the area, began a volume at 10:50 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
May 7, 7:05 AM EDT	Hail 0.75	Seneca, SC
May 7, 7:12 AM EDT	Hail 1.5	Fair Play, SC

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 10.8 hours before the alert went out and 203 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 109 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 535 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at May 6, 2:05 PM EDT, 16 hours 42 minutes earlier.

Area forecast discussion, May 6, 2:05 PM EDT, 16 hours 42 minutes before

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The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 7, 3:09 PM EDT	Severe Thunderstorm Warning	GSP	Graham	36 min
May 7, 3:45 PM EDT	Severe Thunderstorm Warning	GSP	Swain	65 min
May 7, 6:12 PM EDT	Severe Thunderstorm Warning	GSP	Jackson	33 min
May 7, 6:33 PM EDT	Severe Thunderstorm Warning	GSP	Haywood	47 min
May 7, 7:23 PM EDT	Severe Thunderstorm Warning	GSP	Buncombe	47 min
May 7, 7:44 PM EDT	Severe Thunderstorm Warning	GSP	Caldwell	31 min
May 7, 7:27 AM EDT	Severe Thunderstorm Warning	GSP	Greenville	33 min
May 7, 6:32 AM EDT	Severe Thunderstorm Warning	GSP	Franklin	33 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 1999 Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.